linux-kernel - [PATCH 6/7] PCI: Log bridge windows conditionally

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20231205171119.680358-7-helgaas@kernel.org>
Date:   Tue,  5 Dec 2023 11:11:18 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     linux-pci@...r.kernel.org
Cc:     Puranjay Mohan <puranjay12@...il.com>,
        linux-kernel@...r.kernel.org, Bjorn Helgaas <bhelgaas@...gle.com>
Subject: [PATCH 6/7] PCI: Log bridge windows conditionally

From: Bjorn Helgaas <bhelgaas@...gle.com>

Previously pci_read_bridge_io(), pci_read_bridge_mmio(), and
pci_read_bridge_mmio_pref() unconditionally logged the bridge window
resource.  A future change will call these functions earlier and more
often.  Add a "log" parameter so callers can control whether to generate
the log message.  No functional change intended.

Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
---
 drivers/pci/probe.c | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 5ac9c150e68b..485d8c7aae04 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -344,7 +344,8 @@ static void pci_read_bases(struct pci_dev *dev, unsigned int howmany, int rom)
 	}
 }
 
-static void pci_read_bridge_io(struct pci_dev *dev, struct resource *res)
+static void pci_read_bridge_io(struct pci_dev *dev, struct resource *res,
+			       bool log)
 {
 	u8 io_base_lo, io_limit_lo;
 	unsigned long io_mask, io_granularity, base, limit;
@@ -377,11 +378,13 @@ static void pci_read_bridge_io(struct pci_dev *dev, struct resource *res)
 		region.start = base;
 		region.end = limit + io_granularity - 1;
 		pcibios_bus_to_resource(dev->bus, res, &region);
-		pci_info(dev, "  bridge window %pR\n", res);
+		if (log)
+			pci_info(dev, "  bridge window %pR\n", res);
 	}
 }
 
-static void pci_read_bridge_mmio(struct pci_dev *dev, struct resource *res)
+static void pci_read_bridge_mmio(struct pci_dev *dev, struct resource *res,
+				 bool log)
 {
 	u16 mem_base_lo, mem_limit_lo;
 	unsigned long base, limit;
@@ -396,11 +399,13 @@ static void pci_read_bridge_mmio(struct pci_dev *dev, struct resource *res)
 		region.start = base;
 		region.end = limit + 0xfffff;
 		pcibios_bus_to_resource(dev->bus, res, &region);
-		pci_info(dev, "  bridge window %pR\n", res);
+		if (log)
+			pci_info(dev, "  bridge window %pR\n", res);
 	}
 }
 
-static void pci_read_bridge_mmio_pref(struct pci_dev *dev, struct resource *res)
+static void pci_read_bridge_mmio_pref(struct pci_dev *dev, struct resource *res,
+				      bool log)
 {
 	u16 mem_base_lo, mem_limit_lo;
 	u64 base64, limit64;
@@ -446,7 +451,8 @@ static void pci_read_bridge_mmio_pref(struct pci_dev *dev, struct resource *res)
 		region.start = base;
 		region.end = limit + 0xfffff;
 		pcibios_bus_to_resource(dev->bus, res, &region);
-		pci_info(dev, "  bridge window %pR\n", res);
+		if (log)
+			pci_info(dev, "  bridge window %pR\n", res);
 	}
 }
 
@@ -518,9 +524,9 @@ void pci_read_bridge_bases(struct pci_bus *child)
 	for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
 		child->resource[i] = &dev->resource[PCI_BRIDGE_RESOURCES+i];
 
-	pci_read_bridge_io(child->self, child->resource[0]);
-	pci_read_bridge_mmio(child->self, child->resource[1]);
-	pci_read_bridge_mmio_pref(child->self, child->resource[2]);
+	pci_read_bridge_io(child->self, child->resource[0], true);
+	pci_read_bridge_mmio(child->self, child->resource[1], true);
+	pci_read_bridge_mmio_pref(child->self, child->resource[2], true);
 
 	if (dev->transparent) {
 		pci_bus_for_each_resource(child->parent, res) {
-- 
2.34.1